Spiders creeping into your space? While many of these eight-legged visitors are harmless and even beneficial, some can be unwelcome guests—especially the venomous ones. Understanding what kinds of spiders you’re dealing with is the first step in managing them safely and effectively. Spider Anatomy 101: Spiders have two main body sections: the cephalothorax (a combined head and thorax) and the abdomen, connected by a narrow waist. They’re equipped with eight legs, venom-injecting fangs, and pedipalps that help them grab prey—making them perfectly adapted for their role as nature’s pest controllers.